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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance at Dec. 31, 2020 $ 1,449.6 $ 0.3 $ 308.3 $ 1,817.9 $ (184.0) $ (492.8)
Balance (in shares) at Dec. 31, 2020   25,433,048        
Increase (Decrease) in Stockholders' Equity            
Net income 292.9     292.9    
Other comprehensive loss (income), net of taxes 28.1       28.1  
Purchases of treasury stock (18.6)         (18.6)
Net issuance of treasury shares to stock compensation plans 0.5   (7.9)     8.4
Net issuance of treasury shares to stock compensation plans (in shares)   (75,371)        
Stock-based compensation 13.2   13.2      
Dividends declared (11.7)     (11.7)    
Ending balance at Jun. 30, 2021 1,754.0 $ 0.3 313.6 2,099.1 (155.9) (503.1)
Balance (in shares) at Jun. 30, 2021   25,357,677        
Beginning balance at Mar. 31, 2021 1,576.6 $ 0.3 305.7 1,914.2 (156.2) (487.3)
Balance (in shares) at Mar. 31, 2021   25,367,736        
Increase (Decrease) in Stockholders' Equity            
Net income 191.0     191.0    
Other comprehensive loss (income), net of taxes 0.3       0.3  
Purchases of treasury stock (18.6)         (18.6)
Net issuance of treasury shares to stock compensation plans 4.0   1.1     2.9
Net issuance of treasury shares to stock compensation plans (in shares)   (10,059)        
Stock-based compensation 6.8   6.8      
Dividends declared (6.0)     (6.0)    
Ending balance at Jun. 30, 2021 1,754.0 $ 0.3 313.6 2,099.1 (155.9) (503.1)
Balance (in shares) at Jun. 30, 2021   25,357,677        
Beginning balance at Dec. 31, 2021 1,825.2 $ 0.3 325.8 2,345.9 (156.2) (690.4)
Balance (in shares) at Dec. 31, 2021   25,336,054        
Increase (Decrease) in Stockholders' Equity            
Net income 398.9     398.9    
Other comprehensive loss (income), net of taxes 28.0       28.0  
Purchases of treasury stock (254.1)         (254.1)
Net issuance of treasury shares to stock compensation plans 3.7   (9.0)     12.7
Net issuance of treasury shares to stock compensation plans (in shares)   (77,310)        
Stock-based compensation 15.0   15.0      
Dividends declared (12.2)     (12.2)    
Ending balance at Jun. 30, 2022 2,004.5 $ 0.3 331.8 2,732.5 (128.3) (931.8)
Balance (in shares) at Jun. 30, 2022   25,258,744        
Beginning balance at Mar. 31, 2022 1,949.2 $ 0.3 324.2 2,542.7 (120.6) (797.3)
Balance (in shares) at Mar. 31, 2022   25,266,915        
Increase (Decrease) in Stockholders' Equity            
Net income 195.9     195.9    
Other comprehensive loss (income), net of taxes (7.7)       (7.7)  
Purchases of treasury stock (138.9)         (138.9)
Net issuance of treasury shares to stock compensation plans 5.0   0.6     4.4
Net issuance of treasury shares to stock compensation plans (in shares)   (8,171)        
Stock-based compensation 7.0   7.0      
Dividends declared (6.1)     (6.1)    
Ending balance at Jun. 30, 2022 $ 2,004.5 $ 0.3 $ 331.8 $ 2,732.5 $ (128.3) $ (931.8)
Balance (in shares) at Jun. 30, 2022   25,258,744